Response to Hi Ryland, this would be the replacement valve we would suggest for the AquaTools AT3118 sand filter and would fix the issues you are having. Please note that the the original valve on the AT3118 was a WC112-148 which was discontinued. This valve is the replacement for the WC112-148 valve however the plumbing port locations are in a different spot so there may be some minor re-plumbing.

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